<template>
  <div class="detail">
    <Header/>
    <div class="main">
      <div class="course-info">
        <div class="wrap-left">
          <!--步骤3-->
          <videoPlayer
            class="video-player vjs-custom-skin"
            ref="videoPlayer"
            :playsinline="true"
            :options="playerOptions"
            @play="onPlayerPlay($event)"
            @pause="onPlayerPause($event)">
          </videoPlayer>
        </div>
        <div class="wrap-right">
          <h3 class="course-name">{{course.name}}</h3>
          <p class="data">{{course.students}}人在学&nbsp;&nbsp;&nbsp;&nbsp;课程总时长：{{course.lessons}}课时/{{course.pub_lessons==course.lessons?'更新完成':`已更新${course.pub_lessons}课时`}}&nbsp;&nbsp;&nbsp;&nbsp;难度：{{course.level_name}}</p>
          <div class="sale-time" v-if="course.discount_name">
            <p class="sale-type">{{course.discount_name}}</p>
            <p class="expire">距离结束：仅剩 {{course.activity_time/(24*3600) | time_format}}天 {{course.activity_time/3600%24 | time_format}}小时 {{course.activity_time/60%60 | time_format}}分 <span class="second">{{course.activity_time%60 | time_format}}</span> 秒</p>
          </div>
          <div class="sale-time" v-else>
            <p class="sale-type">价格 ¥ {{course.real_price}}</p>
          </div>
          <p class="course-price" v-if="course.discount_name">
            <span>活动价</span>
            <span class="discount">¥{{course.real_price}}</span>
            <span class="original">¥{{course.price}}</span>
          </p>
          <div class="buy">
            <div class="buy-btn">
              <button class="buy-now">立即购买</button>
              <button class="free">免费试学</button>
            </div>
            <div class="add-cart" @click="addCart"><img src="/static/image/cart-yellow.svg" alt="">加入购物车</div>
          </div>
        </div>
      </div>
      <div class="course-tab">
        <ul class="tab-list">
          <li :class="tabIndex==1?'active':''" @click="tabIndex=1">详情介绍</li>
          <li :class="tabIndex==2?'active':''" @click="tabIndex=2">课程章节 <span :class="tabIndex!=2?'free':''">(试学)</span></li>
          <li :class="tabIndex==3?'active':''" @click="tabIndex=3">用户评论 (42)</li>
          <li :class="tabIndex==4?'active':''" @click="tabIndex=4">常见问题</li>
        </ul>
      </div>
      <div class="course-content">
        <div class="course-tab-list">
          <div class="tab-item" v-if="tabIndex==1">
            <div v-html="course.brief_html"></div>
          </div>
          <div class="tab-item" v-if="tabIndex==2">
            <div class="tab-item-title">
              <p class="chapter">课程章节</p>
              <p class="chapter-length">共{{chapter_list.length}}章 {{course.lessons}}个课时</p>
            </div>
            <div class="chapter-item" v-for="chapter in chapter_list">
              <p class="chapter-title"><img src="/static/image/1.svg" alt="">第{{chapter.chapter}}章·{{chapter.name}}</p>
              <ul class="lesson-list">
                <li class="lesson-item" v-for="lesson in chapter.coursesections">
                  <p class="name"><span class="index">{{chapter.chapter}}-{{lesson.lesson}}</span> {{lesson.name}}<span class="free" v-if="lesson.free_trail">免费</span></p>
                  <p class="time">07:30 <img src="/static/image/chapter-player.svg"></p>
                  <button class="try" v-if="lesson.free_trail">立即试学</button>
                  <button class="try" v-else>立即购买</button>
                </li>
              </ul>
            </div>
          </div>
          <div class="tab-item" v-if="tabIndex==3">
            用户评论
          </div>
          <div class="tab-item" v-if="tabIndex==4">
            常见问题
          </div>
        </div>
        <div class="course-side">
          <div class="teacher-info">
            <h4 class="side-title"><span>授课老师</span></h4>
            <div class="teacher-content">
              <div class="cont1">
                <!-- 避免出现 图片未定义的情况  -->
                <img :src="course.teacher && course.teacher.image">
                <div class="name">
                  <p class="teacher-name">{{course.teacher.name}}</p>
                  <p class="teacher-title">{{course.teacher.signature}} {{course.teacher.title}}</p>
                </div>
              </div>
              <p class="narrative" >{{course.teacher.brief}}</p>
            </div>
          </div>
        </div>
      </div>
    </div>
    <Footer/>
  </div>
</template>


<!--使用video-player-->
<!--1 通过import 导入 videoPlayer组件-->
<!--2 在vue组件中的component，注册播放器插件-->
<!--3 在html中调用videoPlayer组件标签-->
<!--4 打data中配置播放器的相关参数-->


<script>
  import Header from "./common/Header"
  import Footer from "./common/Footer"
  // 步骤1
  import {videoPlayer} from 'vue-video-player'
  export default {
    name: "Detail",
    data(){
      return {
        course_id: 0,
        course: {
          teacher:{}
        },
        chapter_list: [],
        tabIndex:2, // 当前选项卡显示的下标
        playerOptions: {
          playbackRates: [0.7, 1.0, 1.5, 2.0], // 播放速度
          autoplay: false, //如果true,则自动播放
          muted: false, // 默认情况下将会消除任何音频。
          loop: false, // 循环播放
          preload: 'auto',  // 建议浏览器在<video>加载元素后是否应该开始下载视频数据。auto浏览器选择最佳行为,立即开始加载视频（如果浏览器支持）
          language: 'zh-CN', // 字幕
          aspectRatio: '16:9', // 将播放器置于流畅模式，并在计算播放器的动态大小时使用该值。值应该代表一个比例 - 用冒号分隔的两个数字（例如"16:9"或"4:3"）
          fluid: true, // 当true时，Video.js player将拥有流体大小。换句话说，它将按比例缩放以适应其容器。
          sources: [{ // 播放资源和资源格式
            type: "video/mp4",
            src: "http://img.ksbbs.com/asset/Mon_1703/05cacb4e02f9d9e.mp4" //你的视频地址（必填）
          }],
          poster: "/static/image/course-cover.jpeg", //视频封面图
          width: document.documentElement.clientWidth, // 默认视频全屏时的最大宽度
          notSupportedMessage: '此视频暂无法播放，请稍后再试', //允许覆盖Video.js无法播放媒体源时显示的默认信息。
        },
      }
    },
    filters:{
      time_format(time){
        time = parseInt(time);
        if(time < 10){
          time = "0"+time;
        }
        return time;
      }
    },
    created(){
      // 课程ID
      this.get_course_id();
      this.get_course_info();
      this.get_course_chapter();
    },
    methods: {
      get_course_id(){
        let course_id = this.$route.params.id;
        if(course_id > 0){
          this.course_id = parseInt( course_id );
        }else{
          let self = this;
          this.$alert("对不起，访问页面参数有误！","错误",{
            // 返回上一次访问的页面
            callback(){
              self.$router.go(-1);
            }
          });
          return false;
        }
        return course_id;
      },
      get_course_info(){
        // 获取课程信息
        this.$axios.get(`${this.$settings.HOST}/course/${this.course_id}/`).then(response=>{
          this.course = response.data;
          this.playerOptions.sources[0].src=response.data.course_video;
          this.playerOptions.poster = response.data.course_img;
          // 设置活动进行时，课程优惠的倒计时
          if(this.course.activity_time > 0){
            let timer = setInterval(()=>{
              if( this.course.activity_time > 1 ){
                this.course.activity_time-=1;
              }else{
                clearInterval(timer);
              }
            },1000)
          }
        }).catch(error=>{
          this.$messge.error(error.response.data);
        })
      },
      get_course_chapter(){
        // 获取当前课程的章节列表
        this.$axios.get(`${this.$settings.HOST}/course/chapter/`,{
          params:{
            course: this.course_id,
          }
        }).then(response=>{
          this.chapter_list = response.data;

        }).catch(error=>{
          this.$messge.error(error.response.data);
        })
      },
      check_user_login(){
        let token = localStorage.user_token || sessionStorage.user_token;
        if( !token ){
          let self = this;
          this.$confirm("对不起，您尚未登录！所以请登录再使用购物车","路飞学城",{
            confirmButtonText: '确定',
            cancelButtonText: '取消',
            type: 'warning'
          }).then(() => {
            self.$router.push("/user/login");
          });
          return false; // 阻止js继续往下执行
        }
        return token;
      },
      addCart(){
        // 添加商品必须用户已经登录了
        let token = this.check_user_login();
        // 添加商品到购物车
        this.$axios.post(`${this.$settings.HOST}/cart/`,{
          course_id: this.course_id,
        },{
          headers:{
            // 提交jwt的时候，必须想后端声明，当前token类型是jwt生成的，
            // 所以中间必须有个空格！！
            "Authorization": "jwt " + token,
          }
        }).then(response=>{
          this.$message.success(response.data.message);

          // vue里面进行数据共享：在vue里面有些公共的数据想要共享出来，
          // 多个组件及时共享数据：vuex（在项目的根目录：npm install -S vuex）
          // 更新vuex中购物车商品总数
          // add_cart 是store 下面的方法
          this.$store.commit("add_cart", response.data.cart_length);
        }).catch(error=>{
          this.$message.error(error.response.data.message);
        })
      },
      onPlayerPlay(event){
        // 当视频播放时，执行的方法
        alert("关闭广告");
      },
      onPlayerPause(event){
        // 当视频暂停播放时，执行的方法
        alert("显示广告");
      },
    },

    components:{
      Header,
      Footer,
      // 步骤2
      videoPlayer,
    }
  }
</script>

<style scoped>
  .main{
    background: #fff;
    padding-top: 30px;
  }
  .course-info{
    width: 1200px;
    margin: 0 auto;
    overflow: hidden;
  }
  .wrap-left{
    float: left;
    width: 690px;
    height: 388px;
    background-color: #000;
  }
  .wrap-right{
    float: left;
    position: relative;
    height: 388px;
  }
  .course-name{
    font-size: 20px;
    color: #333;
    padding: 10px 23px;
    letter-spacing: .45px;
  }
  .data{
    padding-left: 23px;
    padding-right: 23px;
    padding-bottom: 16px;
    font-size: 14px;
    color: #9b9b9b;
  }
  .sale-time{
    width: 464px;
    background: #fa6240;
    font-size: 14px;
    color: #4a4a4a;
    padding: 10px 23px;
    overflow: hidden;
  }
  .sale-type {
    font-size: 16px;
    color: #fff;
    letter-spacing: .36px;
    float: left;
  }
  .sale-time .expire{
    font-size: 14px;
    color: #fff;
    float: right;
  }
  .sale-time .expire .second{
    width: 24px;
    display: inline-block;
    background: #fafafa;
    color: #5e5e5e;
    padding: 6px 0;
    text-align: center;
  }
  .course-price{
    background: #fff;
    font-size: 14px;
    color: #4a4a4a;
    padding: 5px 23px;
  }
  .discount{
    font-size: 26px;
    color: #fa6240;
    margin-left: 10px;
    display: inline-block;
    margin-bottom: -5px;
  }
  .original{
    font-size: 14px;
    color: #9b9b9b;
    margin-left: 10px;
    text-decoration: line-through;
  }
  .buy{
    width: 464px;
    padding: 0px 23px;
    position: absolute;
    left: 0;
    bottom: 20px;
    overflow: hidden;
  }
  .buy .buy-btn{
    float: left;
  }
  .buy .buy-now{
    width: 125px;
    height: 40px;
    border: 0;
    background: #ffc210;
    border-radius: 4px;
    color: #fff;
    cursor: pointer;
    margin-right: 15px;
    outline: none;
  }
  .buy .free{
    width: 125px;
    height: 40px;
    border-radius: 4px;
    cursor: pointer;
    margin-right: 15px;
    background: #fff;
    color: #ffc210;
    border: 1px solid #ffc210;
  }
  .add-cart{
    float: right;
    font-size: 14px;
    color: #ffc210;
    text-align: center;
    cursor: pointer;
    margin-top: 10px;
  }
  .add-cart img{
    width: 20px;
    height: 18px;
    margin-right: 7px;
    vertical-align: middle;
  }

  .course-tab{
    width: 100%;
    background: #fff;
    margin-bottom: 30px;
    box-shadow: 0 2px 4px 0 #f0f0f0;

  }
  .course-tab .tab-list{
    width: 1200px;
    margin: auto;
    color: #4a4a4a;
    overflow: hidden;
  }
  .tab-list li{
    float: left;
    margin-right: 15px;
    padding: 26px 20px 16px;
    font-size: 17px;
    cursor: pointer;
  }
  .tab-list .active{
    color: #ffc210;
    border-bottom: 2px solid #ffc210;
  }
  .tab-list .free{
    color: #fb7c55;
  }
  .course-content{
    width: 1200px;
    margin: 0 auto;
    background: #FAFAFA;
    overflow: hidden;
    padding-bottom: 40px;
  }
  .course-tab-list{
    width: 880px;
    height: auto;
    padding: 20px;
    background: #fff;
    float: left;
    box-sizing: border-box;
    overflow: hidden;
    position: relative;
    box-shadow: 0 2px 4px 0 #f0f0f0;
  }
  .tab-item{
    width: 880px;
    background: #fff;
    padding-bottom: 20px;
    box-shadow: 0 2px 4px 0 #f0f0f0;
  }
  .tab-item-title{
    justify-content: space-between;
    padding: 25px 20px 11px;
    border-radius: 4px;
    margin-bottom: 20px;
    border-bottom: 1px solid #333;
    border-bottom-color: rgba(51,51,51,.05);
    overflow: hidden;
  }
  .chapter{
    font-size: 17px;
    color: #4a4a4a;
    float: left;
  }
  .chapter-length{
    float: right;
    font-size: 14px;
    color: #9b9b9b;
    letter-spacing: .19px;
  }
  .chapter-title{
    font-size: 16px;
    color: #4a4a4a;
    letter-spacing: .26px;
    padding: 12px;
    background: #eee;
    border-radius: 2px;
    display: -ms-flexbox;
    display: flex;
    -ms-flex-align: center;
    align-items: center;
  }
  .chapter-title img{
    width: 18px;
    height: 18px;
    margin-right: 7px;
    vertical-align: middle;
  }
  .lesson-list{
    padding:0 20px;
  }
  .lesson-list .lesson-item{
    padding: 15px 20px 15px 36px;
    cursor: pointer;
    justify-content: space-between;
    position: relative;
    overflow: hidden;
  }
  .lesson-item .name{
    font-size: 14px;
    color: #666;
    float: left;
  }
  .lesson-item .index{
    margin-right: 5px;
  }
  .lesson-item .free{
    font-size: 12px;
    color: #fff;
    letter-spacing: .19px;
    background: #ffc210;
    border-radius: 100px;
    padding: 1px 9px;
    margin-left: 10px;
  }
  .lesson-item .time{
    font-size: 14px;
    color: #666;
    letter-spacing: .23px;
    opacity: 1;
    transition: all .15s ease-in-out;
    float: right;
  }
  .lesson-item .time img{
    width: 18px;
    height: 18px;
    margin-left: 15px;
    vertical-align: text-bottom;
  }
  .lesson-item .try{
    width: 86px;
    height: 28px;
    background: #ffc210;
    border-radius: 4px;
    font-size: 14px;
    color: #fff;
    position: absolute;
    right: 20px;
    top: 10px;
    opacity: 0;
    transition: all .2s ease-in-out;
    cursor: pointer;
    outline: none;
    border: none;
  }
  .lesson-item:hover{
    background: #fcf7ef;
    box-shadow: 0 0 0 0 #f3f3f3;
  }
  .lesson-item:hover .name{
    color: #333;
  }
  .lesson-item:hover .try{
    opacity: 1;
  }

  .course-side{
    width: 300px;
    height: auto;
    margin-left: 20px;
    float: right;
  }
  .teacher-info{
    background: #fff;
    margin-bottom: 20px;
    box-shadow: 0 2px 4px 0 #f0f0f0;
  }
  .side-title{
    font-weight: normal;
    font-size: 17px;
    color: #4a4a4a;
    padding: 18px 14px;
    border-bottom: 1px solid #333;
    border-bottom-color: rgba(51,51,51,.05);
  }
  .side-title span{
    display: inline-block;
    border-left: 2px solid #ffc210;
    padding-left: 12px;
  }

  .teacher-content{
    padding: 30px 20px;
    box-sizing: border-box;
  }

  .teacher-content .cont1{
    margin-bottom: 12px;
    overflow: hidden;
  }

  .teacher-content .cont1 img{
    width: 54px;
    height: 54px;
    margin-right: 12px;
    float: left;
  }
  .teacher-content .cont1 .name{
    float: right;
  }
  .teacher-content .cont1 .teacher-name{
    width: 188px;
    font-size: 16px;
    color: #4a4a4a;
    padding-bottom: 4px;
  }
  .teacher-content .cont1 .teacher-title{
    width: 188px;
    font-size: 13px;
    color: #9b9b9b;
    white-space: nowrap;
  }
  .teacher-content .narrative{
    font-size: 14px;
    color: #666;
    line-height: 24px;
  }
</style>

